You should not eat any solid food the day before a colonoscopy. Most medical guidelines and clinics instruct patients to start a clear liquid diet beginning one full day before the procedure. This means no solid foods—only clear liquids such as water, clear juices (without pulp), broth, clear sodas, coffee or tea without milk, gelatin, popsicles, and sports drinks are allowed[1][3][4]. The clear liquid diet helps ensure your colon is completely clean for the procedure.
Leading up to this, several days before your colonoscopy (usually three to five days, depending on your doctor’s instructions), you may be told to follow a low-fiber or low-residue diet to make bowel preparation easier. This diet includes foods like white bread, white rice, plain pasta, peeled fruit, eggs, chicken, and fish but excludes high-fiber foods such as whole grains, seeds, nuts, raw vegetables, and fruit with skin[1][3][4][5][7]. Strict adherence to these dietary changes improves the effectiveness of the bowel prep and the quality of the colonoscopy[2].
You must also stop drinking clear liquids—usually four hours before the procedure, as instructed by your doctor. After your colonoscopy, you can gradually return to a normal diet unless you receive other directions from your healthcare provider[1].
References
- [1] Colonoscopy Prep – Colorectal Cancer Screening | UCLA Health
- [2] Impact of diet restriction on bowel preparation for colonoscopy – PMC
- [3] Shopping List for Your Colonoscopy Prep | Colorectal Cancer Alliance
- [4] How to Prepare for a Colonoscopy – WebMD
- [5] Low-Fiber Diet for Colonoscopy | Lahey Health
- [7] Low-Fiber Diet for Colonoscopy Preparation | Kaiser Permanente
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